Please click here to visit our nVent Thermal YouTube channel to access installation videos for our nVent Nuheat Signature, Home and Element thermostats.
The red light is on or blinking on the thermostat.
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Cause
Solution
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The GFCI Test button has been pressed manually.
When the GFCI Test Button has been pressed, the screen will display “GFCI Error – Ground fault detected” and the RED light will be activated. This is normal. Cancel the error message by pressing the Reset Button (on the lower right side of the thermostat) once.
This message is supposed to appear each time you press this button as you are testing to ensure that the GFCI safety feature works, much like testing an alarm.
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The Ground Fault Circuit Interrupter (GFCI) has been triggered.
Determine the blinking pattern and then see the instructions Steps below.
Solid red light – press the on/off button to reset the GFCI.
If the red light on your unit is located at the TOP or on the RIGHT side of the thermostat and the red light does not turn off, this indicates that there is a ground fault in the heating system. Contact your electrician or installer to verify the wiring and test the system with a digital multimeter.
Slow blink - Press the on/off button to reset the GFCI.
Fast blink - This indicates that there is a ground fault in the heating system. Call your electrician or installer to verify the wiring and test the system with a digital multimeter.
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The system has not been wired or grounded properly.
The electrician needs to inspect the wiring of the thermostat and mats/cable. Have the electrician see steps below for instructions.
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If the causes above do not solve the issue, please follow the instructions below.
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Steps for Homeowner:
- At the thermostat location, press the reset button located on the bottom right side of the thermostat faceplate once to see if the error message and RED light will reset (click here to open the Operating Manual for reference).
- If the error message and RED light disappear, set the thermostat to 'Heat' and allow the floor to heat up.
- If the floor heats and the error message and RED light do not reappear, continue to operate the system normally.
- If the thermostat trips the GFCI as soon as the heating indicators are displayed on the screen, please call your electrician and proceed to electrician troubleshooting (Step 2).
- If the error message and RED light do not disappear, turn OFF the circuit breaker controlling the floor heating circuit. Leave the breaker OFF for 10 seconds, then turn the breaker back ON.
- If the thermostat resets and the floor heats up, continue to operate the system normally.
- If the thermostat displays the error message and RED light as soon as the power is turned back ON, contact an electrician and have them come to the site to perform steps 2 to 6.
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Steps for Electrician:
A. Please read and follow the steps noted below.
B. If the issues are not resolved, or if any assistance is required, we recommend that the electrician and homeowner call nVent NUHEAT Tech Support when the electrician is on site so that we can ensure all trouble shooting steps have been conducted properly and explain any next steps.
- At the breaker panel, turn OFF the circuit breaker controlling the floor heating circuit.
- Confirm the supply breaker is a standard breaker (not GFCI)
- If the breaker is a GFCI, replace with a standard breaker and attempt to heat the floor.
- Confirm if the supply breaker is a dedicated line, only connected to the floor heating system.
- If the line is shared with other appliances, correct the wiring to comply with installation requirements (dedicated circuit).
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At the thermostat location, remove the faceplate (there is a small screw at the bottom of the faceplate - loosen the screw but do not remove it) and remove the thermostat base from the wall.
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Inspect the wiring at the back of the thermostat and in the junction box in the wall.
- Ensure that there is no damage to the wires or thermostat.
- Ensure that the system is grounded properly. The braided metallic shields of the mat/cable should be tied to the grounding screw or copper in the junction box.
- Verify the wiring to the correct wiring diagram for the unit.
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Disconnect the mat/cable (load) wires connected to terminals 1 & 4 on the thermostat backplate.
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Using a digital multimeter with a fully charged battery set to 200 Ohms, perform the Resistance and Insulation tests. Instructions for how to perform these tests can be found in the Mat Installation Guide here.
Testing Notes
Ensure all Insulation and Resistance testing is done at the factory cold lead location. If the mat or cable cold lead (load wire) has been terminated in a junction box (other than the thermostat location), you will need to access and test from the factory cold lead location.
If there are multiple cold leads (load wires) from the floor, test each mat/cable cold lead separately and record your findings for each.
For 240 V mats or cables that are 20 sq. ft. or smaller, you will need to set your digital multi-meter to 2K ohms
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If the Ohms reading for the Resistance test is outside the testing parameters (more than 10% above/ 5% below or showing an open line) then the heating element has been affected and will need to be inspected by a technician.
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Measure the voltage on the line side of the thermostat and ensure that it is the same voltage the load is rated for.
- If the line voltage matches the load voltage, click here to fill out a Repair Request form. Please make note of the Ohms and Insulation tests readings, notes on troubleshooting steps taken. Please take a photograph of the mat/cable UL/CSA tag that is on the end of the lead wires.
- If the line voltage measured is higher than the voltage rating for the load, the heating element is not repairable.
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If the Ohms reading for the Insulation test is outside the testing parameters (any Ohms reading other than an open line) then the heating element has been affected and will need to be inspected by a technician.
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Measure the voltage on the line side of the thermostat and ensure that it is the same voltage the load is rated for.
- If the line voltage matches the load voltage, click here to fill out the Repair Request form. Please make note of the Ohms and Insulation tests readings, notes on troubleshooting steps taken. Please take a photograph of the mat/cable UL/CSA tag that is on the end of the lead wires.
- If the line voltage measured is higher than the voltage rating for the load, the heating element is not repairable.
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If the Insulation and Resistance tests pass inspection (Step 5), the next steps is to test the thermostats built-in GFCI.
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At the breaker panel, turn OFF the circuit breaker controlling the floor heating circuit.
- Disconnect the mat/cable (load) wires connected to terminals 1 & 4 on the thermostat backplate.
- Turn ON the circuit breaker controlling the floor heating circuit.
- If it did not come on by itself, press & hold the ON/OFF button (located on the bottom right side of the thermostat faceplate) for 4 seconds.
- Set the thermostat to 'Heat' the floor
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If the thermostat trips the GFCI with no load attached, then the thermostat's GFCI will need to be replaced. Please check the proof of purchase for the purchase date. For thermostats within the 3 year warranty period, click here to complete the Thermostat Backplate Replacement Form. Proof of Purchase and a photo of the back of the faceplate of the unit is required for all warranty replacements.
For units past the warranty period, please purchase a new thermostat from an authorized dealer and have a certified electrician install it. There is a Where To Buy tool and Find An Installer on www.nuheat.com or contact customer care to help you locate a authorized dealer
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If the thermostat DOES NOT trip the GFCI
For a downloadable PDF of these instructions, please click here.
The screen is blank
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Cause
Solution
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The unit is turned off.
Turn the unit on by pressing the on/off button on the right side of the thermostat. Wait several seconds for the screen to turn on.
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There is no power going to thermostat.
Press the GFCI test button at the top of the thermostat. If the red light at the top of the thermostat (or on the right side depending on the thermostat model) turns on, this indicates that there is power to the thermostat. If not, confirm that the circuit breaker on the electrical panel is ON and/or contact your electrician to confirm/check the wiring.
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The thermostat is no longer functioning.
If the unit was previously functioning properly and now the faceplate is blank and if there is power to the unit and attempts to turn the unit on has been unsuccessful, then the thermostat needs to be replaced. Please check your proof of purchase for purchase date. If your unit is within the 3 year warranty period, please contact nVent NUHEAT Customer Care at 1-800-778-WARM (9276). Proof of purchase is required.
For units past the warranty period, please purchase a new thermostat from an authorized dealer and have a certified electrician install it. There is a
Where to Buy tool and
Find An Installer tool on https://www.nuheat.com/ or contact customer care to help you locate a authorized dealer.
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Wiring on back of thermostat is reversed.
For brand new installs, if the thermostat is blank, most likely the wiring for the line and load terminals have been switched. See Steps for the Electrician below.
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If the causes above do not solve the issue, please follow the instructions below.
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Steps for Homeowner
- At the breaker panel, confirm the circuit breaker controlling the floor heating circuit is ON.
- Cycle the breaker OFF. Hold the breaker OFF for 10 seconds and then turn the breaker back ON.
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At the thermostat, press & hold the ON/OFF button (located on the bottom right side of the thermostat faceplate) for 4 seconds, then release and wait 4 seconds to see if the screen display turns on.
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If the screen does not turn on, press the GFCI Test Button (located on the top of the thermostat) and check for a flashing RED light (located either on the top or right side of the thermostat).
- If the thermostat screen remains blank and the RED light activated when the Test Button was pressed, then the thermostat needs to be replaced. Please check your proof of purchase for the purchase date. For thermostats within the 3 year warranty period, click here to complete the Thermostat Faceplate Replacement Form. Proof of purchase and a photo of the back of the faceplate of the unit is required for all warranty replacements.
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If the RED light does not appear, contact an electrician and have them come to the site to perform steps 4 to 6 using a digital multimeter.
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Steps for Electrician
- At the thermostat junction box location, confirm there is power (120 V / 208 V / 240 V) at the line side of the thermostat (terminals 2 & 3 on the thermostat back plate).
- Confirm the wiring is correct (click here for the quick start wiring guide).
- Incoming power to terminals 2 & 3
- Load wires connected to terminals 1 & 4
- Braided ground shield tied to the house ground
- If the voltage and wiring are correct and the screen is still blank, click here to complete the Thermostat Backplate Replacement Form. Proof of purchase and a photo of the back of the faceplate of the unit is required for all warranty replacements.
For units past the warranty period, please purchase a new thermostat from an authorized dealer and have a certified electrician install it. There is a Where to Buy tool and Find An Installer tool on https://www.nuheat.com/ or contact customer care to help you locate a authorized dealer.
For a downloadable PDF of these instructions, please click here.
Thermostat disconnects from my WiFi network unexpectedly.
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Cause
Solution
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WiFi router set to mixed encryption
Some WiFi routers are factory defaulted to a mixed encryption type meaning it is can be compatible with WPA as well as WPA2 encryption types. When the security setting on the WiFi router is set to mixed encryption (WPA/WPA2), certain routers are having issues staying connected to the SIGNATURE Thermostat. In your WiFi router’s security settings, change the encryption type to WPA2 Only (newer and more secure encryption type than WPA) and try reconnecting your SIGNATURE thermostat to your WiFi network. If using a dual-band router, make this change on the 2.4Ghz band which the SIGNATURE thermostat uses to connect to your WiFi router.
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Wireless interference is disrupting the WiFi connection
The channel on your router is likely set on Auto. If you are experiencing intermittent connection issues while on Auto, try changing to channel 1, 6 or 11 which are the least congested channels for WiFi signals. If using a dual-band router, make this change on the 2.4Ghz band which the SIGNATURE thermostat uses to connect to your WiFi router.
I can't connect to my WiFi network
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Cause
Solution
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WiFi router is set to mixed encryption
Some WiFi routers are factory defaulted to a mixed encryption type meaning it is can be compatible with WPA as well as WPA2 encryption types. When the security setting on the WiFi router is set mixed encryption type, certain routers cannot connect to the SIGNATURE thermostat. In your WiFi router’s security settings, change the encryption type to WPA2 only (newer and more secure encryption type than WPA) and try reconnecting your SIGNATURE thermostat to your WiFi network. If using a dual-band router, make this change on the 2.4Ghz band which the SIGNATURE thermostat uses to connect to your WiFi router.
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WiFi router requires a restart/reboot
The problem might be with your router, even if your other wireless devices are still connected. A simple restart of the router will usually resolve these types of issues. While most routers just need to be unplugged and plugged back into their power source to restart them, you should refer to your router’s documentation for specific instructions.
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WiFi router firmware needs to be updated
Check that your WiFi firmware and drivers have been updated to the latest versions. Contact your Internet Service Provider (ISP) or the router manufacturer for instructions on how to update the firmware and drivers. They are usually available to download from the WiFi router manufacturer's website.
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Your network name is hidden
If you have another device connected to your WiFi network such as your mobile phone, stand next to your SIGNATURE Thermostat and go into your phone’s WiFi Settings to see if the network name is appearing. If you do not see the network, it could mean that your network name is hidden. If your wireless network is hidden, it means you’ve chosen to not have the network name broadcasted to devices. In the WiFi Settings on the SIGNATURE, select ‘Other’ at the bottom and type in the name of your network (aka SSID). Then enter your password when you are prompted.
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Thermostat is too far from WiFi router
Try connecting another device such as your mobile phone to your WiFi network. Standing next to your SIGNATURE Thermostat, go into your phone’s WiFi Settings. If the WiFi signal cannot be detected or is very weak on your phone, it means other devices may have trouble connecting to the network from that area of the home. This means you may be too far away from your WiFi router or there may be a problem with it. If your WiFi router is too far, you can purchase a WiFi signal repeater which will improve the range of the WiFi signal in your home for all devices.
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We have created troubleshooting trees to help troubleshoot Wi-Fi connection issues. See below.
The thermostat is 'Offline'
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Cause
Solution
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WiFi router is set to mixed encryption
Some WiFi routers are factory defaulted to a mixed encryption type meaning it is can be compatible with WPA as well as WPA2 encryption types. When the security setting on the WiFi router is set mixed encryption type, certain routers cannot connect to the SIGNATURE thermostat. In your WiFi router’s security settings, change the encryption type to WPA2 only (newer and more secure encryption type than WPA) and try reconnecting your SIGNATURE thermostat to your WiFi network.
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WiFi router requires a restart/reboot
The problem might be with your router, even if your other wireless devices are still connected. A simple restart of the router will usually resolve these types of issues. While most routers just need to be unplugged and plugged back into their power source to restart them, you should refer to your router’s documentation for specific instructions.
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Your WiFi router is not connected to the internet
Check your WiFi router to ensure it is online. See if other devices connected to your WiFi network are still connected. If other devices are also disconnected from your WiFi network, there may be a problem with your ISP (Internet Service Provider), or your WiFi router. Try restarting your router or ensure your password or security settings hasn’t changed.
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Server maintenance
On occasion and usually in off-peak hours only, our database is being updated so we will take the server offline momentarily while the updates are taking place. It should only be offline for 1-2 minutes before it’s online again. Try logging off and logging back in.
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WiFi router firmware needs to be updated
Check that your WiFi firmware and drivers have been updated to the latest versions. Contact your Internet Service Provider (ISP) or the router manufacturer for instructions on how to update the firmware and drivers. They are usually available to download from the WiFi router manufacturer's website.
The SIGNATURE Thermostat screen says “Thermostat is not functioning properly. Please contact Nuheat.”
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Cause
Solution
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Floor sensor is damaged or not connected properly
Go into SETTINGS, THERMOSTAT INFO, PAGE 2 and check the status of the Floor Sensor. If the status is 'Fail', it could mean that the floor sensor is not installed/connected properly. Loosen the screw at the bottom of the faceplate and remove the faceplate. Ensure there are two small black sensor wires are securely connected to Terminals C and D. It does NOT matter which wire is inserted into each terminal. Re-install the faceplate and check if the error message appears again. If yes, contact your installer to replace the floor sensor which may be damaged.
If the floor sensor is damaged and you wish to control your floor heating system using the ambient/air temperature for the time being, go to SETTINGS, SETUP/PREFERENCES and change 'Temp. control' and 'Temp. display' to Air/Room Temp. The SIGNATURE thermostat will now display the ambient/air temperature and control the floor heating system based on the ambient/air temperature of the room. Switch both Temp control and ‘Temp display’ settings back to Floor temp once the floor sensor is replaced.
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Floor sensor is missing
Go into SETTINGS, THERMOSTAT INFO, PAGE 2 and check the status of the Floor Sensor. If the status is 'Fail', it could mean that the floor sensor is missing. Loosen the screw at the bottom of the faceplate and remove the faceplate. Confirm that there are two small black sensor wires securely connected to Terminals C and D. If there are no wires present, contact your installer to install the floor sensor that came with the thermostat.
If the floor sensor is missing and you wish to control your floor heating system using the ambient/air temperature for the time being, go to SETTINGS, SETUP/PREFERENCES and change 'Temp. control' and 'Temp. display' to Air/Room Temp. The SIGNATURE thermostat will now display the ambient/air temperature and control the floor heating system based on the ambient/air temperature of the room. Switch both Temp control and ‘Temp display’ settings back to Floor temp once the floor sensor is installed.
The time on the SIGNATURE Thermostat is incorrect.
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Cause
Solution
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Weather Settings has not been setup.
On the thermostat, go into SETTINGS > WEATHER SETTINGS. Click ‘Change’ and enter in your zip/postal code. Once you complete the weather setup, the time will be based on your time zone. The ‘Sync with network time’ feature in the Time setup maintains the clock’s accuracy over time. However, the SIGNATURE Thermostat relies on the zip/postal code to attribute the correct time zone.
I am connected to my WiFi network but when I try to setup my weather, it says the “Thermostat must be connected to WiFi network to retrieve weather location.”
My weather information is not accurate
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Cause
Solution
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Wrong ZIP/Postal code
Check your zip code (SETTINGS > WEATHER SETTINGS) to ensure the proper ZIP/Postal code was entered.
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Change in weather between update periods
The weather information on the SIGNATURE thermostat is updated every three hours from the weather database. Although it is fairly accurate and up-to-date, weather changes that occur between update periods may not be reflected on the thermostat.
Floor type and Floor limit features are shaded out and not selectable.
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Cause
Solution
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Temperature control setting is set to be controlled using the air/room temperature
Go to SETTINGS, SETUP/PREFERENCES, change Temp. control and Temp. display settings to Floor temp.
After this change, if you see a message on the screen that says "Thermostat is not functioning properly. Please contact Nuheat.", refer to troubleshooting steps under "The SIGNATURE Thermostat screen says “Thermostat is not functioning properly. Please contact Nuheat.”
Note: When the temperature control setting is set to Room, it ignores the readings from the floor sensor. Without a temperature reading, Floor type and Floor limit features are not possible.
The floor/room temperature information on the app and the website is different than the temperature on the thermostat.
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Cause
Solution
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Time required to sync devices/websites
Any changes on the Nuheat SIGNATURE app, the MyNuheat.com website, or the SIGNATURE Thermostat is communicated to the Nuheat server. The server then pushes the new information out to the other devices. Sometimes there is a slight delay before the information is synced on all the devices.
I can’t control my SIGNATURE via my Nuheat SIGNATURE app
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Cause
Solution
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Wrong app was downloaded
Make sure you've downloaded the Nuheat SIGNATURE app. The app logo should be the red Nuheat "foot".
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Thermostat is offline
Check your WiFi router to ensure it is functioning properly and that you have wireless internet service in the home. Refer to troubleshooting steps under "The thermostat is offline".
I can’t download the Nuheat App on my iPad
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Cause
Solution
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Nuheat SIGNATURE app is categorized as iPhone app
When you open the App Store on your iPad, on the top, select ‘iPhone only’ and you will see the Nuheat SIGNATURE app. The Nuheat SIGNATURE app was created and optimized for smartphones. The app still fully functions on a tablet but it doesn’t stretch to the full tablet screen.
I don't know how to get started
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Cause
Solution
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Complete the WiFi setup process for the SIGNATURE thermostat
In order to access all the wireless features of the SIGNATURE thermostat, you must first connect the SIGNATURE thermostat to your WiFi network. Go into SETTINGS > WIFI SETTINGS and complete the WiFi setup. Once the thermostat is connected to your WiFi network, you will be asked for an email address to begin your MyNuheat.com account setup. An email with an activation link and instructions will be sent to that email address. After your MyNuheat.com account is setup, you can control your SIGNATURE thermostat(s) via MyNuheat.com or download the Nuheat Signature App from the App Store or Google Play.
I have not received an activation email in my inbox to register the SIGNATURE Thermostat
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Cause
Solution
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Email is blocked by your SPAM filters
Check your SPAM folder in your inbox or try another email address. To attempt a resend of the Activation Email, go to
www.mynuheat.com:
1. Enter the email address that you used to complete the WiFi setup on the Signature thermostat.
2. Click on 'Forgot Password'
3. Re-enter the email address.
You will be sent a temporary password that you can use to log in and setup your MyNuheat.com profile.
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Wrong email was entered into the thermostat
On the SIGNATURE Thermostat, go into SETTINGS, THERMOSTAT INFO and confirm the email account was entered correctly.
The screen display is distorted or not responsive
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Cause
Solution
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The faceplate is not properly mounted to the power base
Loosen (but do not remove) the screw at the bottom of the faceplate to detach the faceplate from the power base. Inspect the faceplate and back plate for signs of damage or loose debris at the connector pin location. Re-attach the faceplate to the power base and check if the distortion has disappeared.
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The screen needs to be re-calibrated
1. Loosen the screw at the bottom of the faceplate and remove the faceplate from the power base.
2. With the disconnected faceplate, press & hold your finger down on the center of the touchscreen.
3. With your finger still pressing the center of the screen, re-mount the faceplate onto the power base. You should see the thermostat has now entered its ‘Calibration mode’
4. Follow the instructions on the screen and press and hold the red dot on the corners of the screen until you see the word “Release!” appear on the screen.
5. When the calibration is complete, the screen will begin a countdown from 5 seconds. Before the countdown expires, press the screen to accept the new calibration.
The thermostat is heating outside of the programmed schedule
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Cause
Solution
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The Early Start feature is enabled/on.
The Early Start features uses a predictive algorithm that takes your floor's heating/cooling characteristics and uses it to determine the amount of time it needs to heat (aka "pre-heat") the floor in order for the floor temperature to reach the target temperature in your schedule/programming. Pre-heating is a normal behavior if the Early Start feature is enabled/on.
To disable the Early Start function, go to SETTINGS, SETUP/PREFERENCES, PAGE 2. Select Early Start and choose Off. Click Save.
Note: If Early Start is disabled, the floor will only begin heating AT the time in your program/schedule. If you want the floor to be warm by the time set in your program/schedule but you do not want to enable the Early Start feature, we suggest setting the start time in your program/schedule at least 30-60 minutes before the expected time you want the floor to be warm.
The thermostat is under/overshooting the target floor temperature
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Cause
Solution
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Temp Display and Temp Control settings are set to different modes/settings
The Temp Display setting allows you to choose to DISPLAY the floor temperature OR the ambient/air temperature in the room. This temperature is displayed as the large number on the home screen of the thermostat.
The Temp Control setting allows you to choose whether to CONTROL the floor heating system using the floor temperature OR the ambient/air temperature in the room.
The recommend setting is to set both to Floor temperature. This means the thermostat will display the floor temperature and use the floor temperature to heat or not heat the floor.
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Thermostat is learning the heating/cooling characteristics of your floor
The thermostat should maintain the floor temperature (or ambient/air temperature depending on the Temp Control setting) within 1-2 degrees of the target temperature which is the small number on the home screen of the thermostat. If it overshoots/undershoots the target, it is due to the thermostat needing to learn the heating/cooling characteristic of your floor. This behavior is most prominent in installations where the system is turned on for the first time. It will take 3-5 days of uninterrupted heating/cooling for the thermostat to learn the floor's heating/cooling characteristics. It can also be triggered by a sudden change in temperature or heat loss in the room (eg. caused by weather). This will also temporarily affect the accuracy/ability to maintain the target temperature. After 3-5 days of uninterrupted heating/cooling, the thermostat will adapt to the new temperature characteristics of the floor.
The Signature thermostat unexpectedly sets itself to indefinite hold at 41F (5C)
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Cause
Solution
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Works With Nest integration is enabled
If you have connected the Nuheat Signature thermostat to the Works With Nest integration, whenever the Nest thermostat is manually/automatically set to Away, it signifies to the Signature thermostat that no one is home. The Signature thermostat will override the programming and not heat the floor until the Nest product detects home occupancy and changes to Home setting/status. When the Nest product goes to Home setting/status, the Signature will return to its regular heating program/schedule.
How to use the Away Mode feature
How to create a Wi-Fi hot spot on Android and iOS
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Cause
Solution
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How to create a Wi-Fi hot spot on Android
If you have an Android device, simply follow these instructions to create a Wi-Fi hot spot.
1. Open the Settings app.
2. Press the Network & Internet option.
3. Press the hot spot & tethering option.
4. Toggle the switch next to Wi-Fi hot spot to on.
5. Tap Set up Wi-Fi hot spot to manage name and password settings for your hot spot.
After that is done, you should be able to find the Wi-Fi network from your other devices.
When you are done, simply follow the instructions again and toggle the switch in step 4 back to the off position.
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How to create a Wi-Fi hot spot on iOS
If you are using an iPhone running, here is how to create a Wi-Fi hot spot.
1. Open the Settings app.
2. Tap Personal hot spot.
3. Switch the slider next to Personal hot spot to the on position.
4. From that same screen, you can edit your Wi-Fi password.
After that is done, you should be able to access your Wi-Fi hot spot. When you are done, simply follow the instructions again and switch the slider in step 3 back to the off position to turn off the Wi-Fi network.